Yeah, sorry, no. Even if I had the space, when I get home from work at 1900 the last thing I want to do is more work. It's not like you can just plop some seeds into soil and do nothing until the harvest is ripe—I know, we had a decent family garden when I was a wee lad. Took a lot of work to keep it going.
If I worked 4 or even 6 hours a day—sure, I could add some homework to my day. But not when working 8 hours+commuting. And many people are working even longer days.